No system is closed off by it surroundings.
The zygote, a single cell, implants its self to the uterine wall and it developes into an embyro which is a cluster of cells.
Answer:
B) The alleles are different
Explanation:
Hetero- different
zygous- you can best relate it to specific kind of zygote, or fertilized egg (which has two alleles)
True. Otherwise we would never stop growing although broken bones regain cartilage into solid bone when we break one but it doesn’t expand.
Answer: the two families of nucleic acids, rna and dna make the sequence of nucleotides in the dna or rna codes to make proteins in the cell
Explanation:
